CVE-2026-64123

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: hsr: defer node table free until after RCU readers<br /> <br /> HSR node-list and node-status generic-netlink operations run under<br /> rcu_read_lock(). They walk hsr-&gt;node_db through hsr_get_next_node() and<br /> hsr_get_node_data(), but RTM_DELLINK teardown removes the same node table<br /> with plain list_del() and frees each node immediately.<br /> <br /> That lets a generic-netlink reader hold a struct hsr_node pointer across<br /> hsr_dellink(). In a KASAN build, widening the reader window after<br /> hsr_get_next_node() obtains the node reproduces a slab-use-after-free<br /> when the reader copies node-&gt;macaddress_A; the freeing stack is<br /> hsr_del_nodes() from hsr_dellink().<br /> <br /> Use list_del_rcu() and defer the free through the existing<br /> hsr_free_node_rcu() callback. This matches the lifetime rule used by the<br /> HSR prune paths, which already delete nodes with list_del_rcu() and<br /> call_rcu().